Platen for type-writing machines.



TILLLAM BEDFORD MULOCK, OF WINNIPEG," MANITOBA, CANADA.

Specification of Letters Patent.

PLATEN FOR TYPE-WRITING MACHINES.

" Patented J une 6, 1916.

Application filed November 3, 1915. Serial No. 59,439.

This invention relates to platens for type- `writing machines and hasfor its objectto reduce the noise incident to the type striking theplatens and at the same time prov duce clear impressions.

In order vthat clear impressions of the type 1 may be produced upon thepaper, it isnecessary for'the platens to be provided with a hardsurface, while to lessen the noise, the surface must be capable -ofyielding under the impact of the strokes. To accomplish both results, Iprovide the working surface of thevplatens with metal coverings belowwhich are arranged elastic cushioning material. The metal casing is maderelatively -thin and divided linto small parts in order to obtainthemaximum resiliency without impairing the clearness of. theimpressions.`

be made,

The invention will be first hereinafter described in connection with theaccompanying drawings, which constitute a' part of this specification,and then more specifically defined in the claims at the end of thedescription.

In the accompanying drawings, wherein similar reference characters areused to designate .corresponding parts throughout the several views:Figure l is a side elevation of one end ofa cylinder -platen constructedsubstantially in' accordance with this invention. Fig. 2,1s a transversesection taken on the line II-II of Fig. 1. Fig.

3 is an enlarged fragmentary section taken on the lin'e III-III of Fig.l. Fig. 4 is a side elevation of one end of a cylinder platen havinganother form of metal casing coinposed oflongitudinal strips or1 wires.Fig. 5 is a side elevation of one end of a cylinder platen having anoutside casing comosed'of angularly arranged strips or wires.

ig. 6 is an enlarged section takenon thev line VI-VI of Fig. 4. Fig. 7is' an enlarged fragmentary section taken on the line .VIII-VII of Fig.4. Fig. 8 is an enlarged cross section through a single strand of barewire of which the casing showing the roughened surface of for the platenmay the wire to prevent the paper from slipping and Fig. 9 is a similarView of a modified forni of wire having a covering with a roughenedsurface.

eferringiirst to Figs. l, 2 and 3, the cylinder platen l is providedwith a llayer of soft rubber 2 around which is placed the relativelythin metal covering which, as shown in Fig. 1, may' consist of aspirally arranged wire 3, closely coiled or otherwise arranged to form asubstantially even surface. This coiled wire is of fine gage or verynarrow, so that the impact or stroke of the type will be on o1` againstas small a hard surface as possible. The coiled wire 3 may be secured inplacev by having its extremities turned in and embedded well down withinthe elastic cushioning layer 2, as indicated at 5, or'inany othersuitable manner.

As illustrated in Figs. 4, 6 and 7 the Wire composing the metal casingmay be made in strips or wires arranged longitudinally, or said stripsor wires may. extend angularly across the platen, as at 7 in Fig'. 5,the ends of the strips or wires being suitably se- One way of holdingthese longitudinal strips 6' and angularly arranged strips 7 in place,as 'illustrated in l the drawings,- consists in rabbeting the ends ofthe strips, as at 9, and plac'ing metal bands 8 around the'elasticcushioning layer so as -tooverlap said rabbeted ends of the 1stri-ps. Of course, any other suitable means for retaining the positionupon the may be employed my invention.. l

The wire or strips composing the metal covering for the plateirmay beusedijin a bare state, but theA erably roughened, as .indicated at'lO onthe wire 3 in Fig. 8, to prevent the paperfrom slipping, or in otherwords, to insure thepaper moving Aprecisely with the platen and thusmaintaining the proper `alinem'ent of the typewritten lines ontlfe'ipaper. This roughened surface may be obtained by the use of acid,or in any other suitable manner. If desired, the lwire or strips may becovered with a coating or covering having -a more or less roughenedsurface, as suggested at 3l on the wire 30 in Fig. 9, to accomplish theelastic cushioning layer without departingV frm same purpose. I aniaware that other inodifi- 11d surface thereof is' prefing from minvention, and I therefore reserve the right to make such' changes asfirly fall within the scope of the appended c aims.

Having thus described my invention, what I claim as new and desire tocure by Letters Patent of the United States is:

l. A noise reducing platen for typewriters, having a layer of an elasticcushioning substance, and a hard outside casing surrounding the elasticcushioning layer. and mounted entirely on the same, saidrasing beingcomposed of small parts adapted to move independently of one anotherunder the impact of the type and by reason of theyielding quality oftheelastic cushioning layer.

2. A noise reducing platen for typewriters having a layer of an elasticcushioning substance, and an outside casing composed of' a relativelythin layer of Wire coiled about insegne said elastic cushioning layer toform. a substantially even surface.

3. A noise reducing platen for typewriters having a layer of an elasticcushioningr substance, and an outside casing composed of a relativelythin vlayer of wire coiled In testimony whereof I have signed my -nameto tlns specihcatlon.

WILLIAM REDFORD MULOCK.

,soplan e! this patent my be obtained for ave cents each, by maxamanthefmimener et rasant,

WGA

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